Paint and varnish remover.



. No Drawing.

UNITED STATES-PATENT ornron.

CARLETON ELLIS, 0F LABCHMONT, NEW YORK, ASSIGNOR TO THE CHADELOID CHEMI- CAL COMPANY, OI NEW YORK, N. Y., CORPORATION OF WEST VIRGINIA Specification of Letters Patent.

Patent-ed Feb. 28, 1911.

Application filed December 27, 1906. Serial No. 349,659.

taric and citric acids, readily form esters.

with the various alcohols either by merely boiling a mixture of the acid and alcohol or by suitable treatment with dehydrating agents and the resulting esters have valuable solvent powers for varnish resins so that they are suitable for use in removers forpaint .or varnish. trate produced'by heating a mixture of fusel oil and tartaric acid in a reflux condenser apparatus has a somewhatcharacteristic odor resembling peaches and is a good solvent'for many of the harder resins. A number of useful bodies may be similarly derived, for instance, the'methyl ester which has -a boiling point of 145 (1, vwhile the Commercial amyl tarethyl estercan be cheaph made in severalways, such as by the distillation. of calcium lactate with ethyl sodium sulfate. Of course, if the latter ingredient has been prepared from denatured alcohol a correspondingly mixed ester is produced; Another suitable solvent ester is the diethyl ester of tartaric acid which has a boiling point of 280 C. Other esters are amyl lactic ester, the ethyl ester of oxy-butyric acid and also its methyl ester.

Chloral combines 'with most of the above compounds producing addition products of a powerful solvent character, especially when they are not too viscous. The thicker bodies may, however, be thinned to the desired extent with suitable thinning agents, such as grain or wood alcohol, or loosening solvents of a ketone character, such as acetone, methyl ethyl ketone, oil of acetone, ethyl butyl ketone; various mobile hydrocarbons and also many other loosening solvents, such as various aldehydes may be similarly used. For

example, the solvent properties of the die- .thyl ester of malic acid are developed on dilutiorf with the above thinners. Esters of this character, both in thealiphatic and aromatic series, or their derivatives, such, for instance, as the chloral addition products mentioned may, of course, be combined with various other paint or varnish solvents and other suitable thickening material may be used, such as wood flour, starch, whiting or waxy body which may also by its film-forming properties decrease evaporation under extreme service conditions. An illustrative compostion suitable for general work consists of vamyl tartaric ester, at parts, turpentine, 4 parts, oil of acetone, 4: parts, and paraffin or ceresin wax, 1 part, these'iiigredients being suitably combined and thoroughly incorporated, preferably under gentle heat, although in some instancesthe wax may be omitted from this remover where high consistency is not desired. -Another ifgistrative composition which may be simill'rly compounded and which is suitable for removing shellac finish may comprise amyl lactic ester 16 parts, methyl ethyl ketone 16 parts, denatured alcohol 20 parts, amyl acetate 8 parts, fullers earth 8 parts, Japan wax 2 parts, and sodium stearate 1 part, 211- Y I though under some circumstances the waxy bodies mentioned and also the other thick ening material may be omitted.

' This invention has been described in connection with a number of illustrative ingredients, formulas, proportions and processes,

to the details of which disclosure the in- I vention is not, of course, to be limited;

\Vhat is claimed is:- v

1. The remover for paint or varnish comprising about 4 parts of amyl tartaric ester, about i -parts of turpentine, about a parts or oil of acetone and about 1 part of wax.

'2. The remover for paint or varnish comprising approximately 42 parts of amyl tartaridester, 1- parts of terpene'solvent mate-. rial, 4 parts of ketonic solvent material and waxy thickening material.

3. The remover for paint or varnish comprising an ester of a hydroxy acid combined with thinning material comprising oil of acetone and WliI-h fl waxy body.

4. The remover-for paint or varnish comprising approximately equal parts of an ester of a hydroxy acid, turpentine and oil of acetone combined with evaporation-retarding stiffening material.

5. The remover for paint or varnish comprising a finish solvent ester of a hydroxy 

